A supercharger can have a lubrication system that includes a speed increasing mechanism, accommodated in a second housing, for increasing the rotation speed of a drive shaft and transmitting the increased rotation speed to a rotary shaft. An oil sump can be configured to for hold lubricant oil for l
A supercharger can have a lubrication system that includes a speed increasing mechanism, accommodated in a second housing, for increasing the rotation speed of a drive shaft and transmitting the increased rotation speed to a rotary shaft. An oil sump can be configured to for hold lubricant oil for lubricating the speed increasing mechanism. A pump mechanism can be driven by the rotation of the drive shaft to supply the lubricant oil held in the oil sump to the speed increasing mechanism, in which the pump mechanism is constituted with a screw pump made up of a screw provided on the drive shaft. A pump chamber can rotatably support the drive shaft and accommodate the screw. An oil introduction hole and an oil introduction tube can connect the oil sump and the interior of the pump chamber, and a gap can be formed between the screw and the pump chamber.
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What is claimed is: 1. A supercharger comprising: a drive shaft configured to be driven by the rotation of an engine, the drive shaft extending in a first housing; a supercharging mechanism including a turbine; a rotary shaft connected to the turbine; a speed increasing mechanism accommodated in a
What is claimed is: 1. A supercharger comprising: a drive shaft configured to be driven by the rotation of an engine, the drive shaft extending in a first housing; a supercharging mechanism including a turbine; a rotary shaft connected to the turbine; a speed increasing mechanism accommodated in a second housing located between the engine and the supercharging mechanism, the speed increasing mechanism being configured to increase the rotation speed of the drive shaft and to transmit the increased rotation speed to the rotary shaft; an oil sump configured to hold lubricant oil for lubricating the speed increasing mechanism; and a pump mechanism driven by the rotation of the drive shaft and configured to supply the lubricant oil held in the oil sump to the speed increasing mechanism; wherein the pump mechanism comprises a screw pump including a screw spirally provided concentrically on the drive shaft over the outside round surface of the drive shaft in the first housing, a cylindrical member rotatably supporting the drive shaft with a support device and accommodating the screw, and an oil introduction passage configured to connect the oil sump and the interior of the cylindrical member, and wherein a gap is provided between the peripheral edge portion of the screw and the inside round surface of the cylindrical member. 2. The supercharger of claim 1, wherein the speed increasing mechanism includes a rotary part connected to the drive shaft and a rotated part to which the rotary force of the rotary part is transmitted, with the rotary part and the rotated part increasing the rotation speed of the drive shaft and transmitting it to the rotary shaft, and wherein the lower portion of the housing and the oil sump are connected through a communication flow passage, with the bottom portions of the communication flow passage and the oil sump located lower than the lowermost portion of the rotary part of the speed increasing mechanism so that the lubricant oil supplied to and having lubricated the speed increasing mechanism naturally falls down and returns through the communication flow passage to the oil sump. 3. The supercharger of claim 2 additionally comprising a coolant fluid chamber configured to cool the lubricant oil held in the oil sump, the coolant fluid chamber being defined by a partition wall of the oil sump. 4. The supercharger of claim 2, wherein the pump mechanism, the speed increasing mechanism, and the supercharging mechanism are placed side by side from the engine side along the direction of the drive shaft axis, with the oil sump provided below at least one of the pump mechanism and the speed increasing mechanism. 5. The supercharger of claim 2, wherein the drive shaft and the rotary shaft are disposed coaxially end to end, the drive shaft includes a center hole extending axially from its end face opposing the rotary shaft toward its opposite end, and a communication hole extending from its outside round surface to the center hole, such that the lubricant oil supplied from the oil sump is led through the communication hole into the center hole and further into the speed increasing mechanism. 6. The supercharger of claim 1 additionally comprising a coolant fluid chamber configured to cool the lubricant oil held in the oil sump, the coolant fluid chamber being defined by a partition wall of the oil sump. 7. The supercharger of claim 6, wherein the pump mechanism, the speed increasing mechanism, and the supercharging mechanism are placed side by side from the engine side along the direction of the drive shaft axis, with the oil sump provided below at least one of the pump mechanism and the speed increasing mechanism. 8. The supercharger of claim 7, wherein the drive shaft and the rotary shaft are disposed coaxially end to end, the drive shaft includes a center hole extending axially from its end face opposing the rotary shaft toward its opposite end, and a communication hole extending from its outside round surface to the center hole, such that the lubricant oil supplied from the oil sump is led through the communication hole into the center hole and further into the speed increasing mechanism. 9. The supercharger of claim 8, wherein the opposing end faces of the drive shaft and the rotary shaft are disposed in contact with each other, wherein the turbine of the supercharging mechanism is provided on one end side of the rotary shaft and the speed increasing mechanism is provided on the other end side of the rotary shaft, wherein the rotary shaft is provided with a center hole extending axially from its end face opposing the drive shaft toward the supercharging mechanism, and a communication hole extending from its outside round surface to the center hole, and wherein the center hole in the drive shaft and the center hole in the rotary shaft are communicated with each other so that the lubricant oil supplied through the center hole in the drive shaft is supplied through both the center hole and the communication hole in the rotary shaft to the speed increasing mechanism. 10. The supercharger of claim 9, wherein the opposing ends of the drive shaft and the rotary shaft are fitted together to be freely rotatable relative to each other. 11. The supercharger of claim 6, wherein the drive shaft and the rotary shaft are disposed coaxially end to end, the drive shaft includes a center hole extending axially from its end face opposing the rotary shaft toward its opposite end, and a communication hole extending from its outside round surface to the center hole, such that the lubricant oil supplied from the oil sump is led through the communication hole into the center hole and further into the speed increasing mechanism. 12. The supercharger of claim 1, wherein the pump mechanism, the speed increasing mechanism, and the supercharging mechanism are placed side by side from the engine side along the direction of the drive shaft axis, with the oil sump provided below at least one of the pump mechanism and the speed increasing mechanism. 13. The supercharger of claim 1, wherein the drive shaft and the rotary shaft are disposed coaxially end to end, the drive shaft includes a center hole extending axially from its end face opposing the rotary shaft toward its opposite end, and a communication hole extending from its outside round surface to the center hole, such that the lubricant oil supplied from the oil sump is led through the communication hole into the center hole and further into the speed increasing mechanism. 14. A supercharger comprising: a drive shaft configured to be driven by the rotation of an engine; a supercharging mechanism including a turbine; a rotary shaft connected to the turbine; a speed increasing mechanism accommodated in a housing located between the engine and the supercharging mechanism, the speed increasing mechanism being configured to increase the rotation speed of the drive shaft and to transmit the increased rotation speed to the rotary shaft; an oil sump configured to hold lubricant oil for lubricating the speed increasing mechanism; a pump mechanism driven by the rotation of the drive shaft and configured to supply the lubricant oil held in the oil sump to the speed increasing mechanism; wherein the pump mechanism comprises a screw pump including a screw spirally provided concentrically on the drive shaft over the outside round surface of the drive shaft, a cylindrical member rotatably supporting the drive shaft with a support device and accommodating the screw, and an oil introduction passage configured to connect the oil sump and the interior of the cylindrical member, and wherein a gap is provided between the peripheral edge portion of the screw and the inside round surface of the cylindrical member; and generally disk-shaped flange portions projecting in a direction perpendicular to the drive shaft axis provided at both end side portions of the screw on the outside round surface of the drive shaft, wherein a clearance is provided between the inside round surface of the cylindrical member and the outside round surface of the flange portions, and a pump chamber formed between the outside round surface of the drive shaft and the inside round surface of the cylindrical member and between the flange portions. 15. The supercharger of claim 14, wherein the speed increasing mechanism includes a rotary part connected to the drive shaft and a rotated part to which the rotary force of the rotary part is transmitted, with the rotary part and the rotated part increasing the rotation speed of the drive shaft and transmitting it to the rotary shaft, and wherein the lower portion of the housing and the oil sump are connected through a communication flow passage, with the bottom portions of the communication flow passage and the oil sump located lower than the lowermost portion of the rotary part of the speed increasing mechanism so that the lubricant oil supplied to and having lubricated the speed increasing mechanism naturally falls down and returns through the communication flow passage to the oil sump. 16. The supercharger of claim 14 additionally comprising a coolant fluid chamber configured to cool the lubricant oil held in the oil sump, the coolant fluid chamber being defined by a partition wall of the oil sump. 17. The supercharger of claim 16, wherein the coolant fluid chamber is configured to surround the oil sump. 18. The supercharger of claim 14, wherein the pump mechanism, the speed increasing mechanism, and the supercharging mechanism are placed side by side from the engine side along the direction of the drive shaft axis, with the oil sump provided below at least one of the pump mechanism and the speed increasing mechanism. 19. The supercharger of claim 14, wherein the drive shaft and the rotary shaft are disposed coaxially end to end, the drive shaft includes a center hole extending axially from its end face opposing the rotary shaft toward its opposite end, and a communication hole extending from its outside round surface to the center hole, such that the lubricant oil supplied from the oil sump is led through the communication hole into the center hole and further into the speed increasing mechanism.
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